Hysteresis-damping demagnetizing method for pipeline port

Abstract

The invention discloses a hysteresis-damping demagnetizing method for a pipeline port, relating to the technical field of pipeline systems. In the method, a demagnetizing coil is wound on the port of a pipeline to be demagnetized, a giant magneto-resistive probe is fixed at an outer edge of the pipeline port and is connected with a data interface of a main controller of a demagnetizing device, the demagnetizing coil is connected with a power output end of the main controller, and then, the method is implemented according to the following steps of: picking up a signal of the giant magneto-resistive probe by the main controller, and measuring the magnitude and the direction of residual magnetism of the pipeline; according to the differences in the magnitude, the direction and the materials of the residual magnetism of the pipeline, automatically calculating an output parameter and controlling a circuit part to covert power-frequency alternating current of 50Hz into high-frequency alternating current of 20-45kHz; and reducing voltage, rectifying current, and controlling the magnitude and the direction of the current required for generating a power source to obtain a magnetic field which is identical to the residual magnetism of the pipeline in magnitude and opposite to the residual magnetism of the pipeline in direction. Compared with the traditional demagnetizing technology, thedemagnetizing method disclosed by the invention has the advantages of advanced control manner, reliability in operating, rapidness in demagnetizing and good demagnetizing effect.

Description

technical field [0001] The invention relates to a hysteresis buffer degaussing method for a steel pipeline port. It relates to the technical field of piping systems. Background technique [0002] At present, various methods are used to demagnetize the pipe port: 1) Appropriately change the position of the ground wire of the weldment; 2) Properly adjust the inclination angle of the electrode, and tilt the electrode toward the blowing direction; 3) Use the segmented de-welding method and the short-arc welding method; 4) Use AC welding instead of DC welding; 5) Place ferromagnetic materials that generate symmetrical magnetic fields, and try to make the ferromagnetic materials around the arc evenly distributed; 6) Reduce residual magnetism on weldments; 7) Use anti-degaussing method, That is, let the weldment generate an opposite magnetic field to offset the residual magnetism on the weldment; 8) Use a welding wire with a cross-section of 35-50mm to wind the steel pipe or two b...

AI Technical Summary

Problems solved by technology

Although the two technologies have a certain degree of degaussing, the degaussing effect is not ideal.

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